CN101178977A

CN101178977A - Capacitor

Info

Publication number: CN101178977A
Application number: CNA2007100480437A
Authority: CN
Inventors: 高乾; 龚莉
Original assignee: Shanghai Step Electric Co Ltd
Current assignee: Shanghai Step Electric Co Ltd
Priority date: 2007-11-09
Filing date: 2007-11-09
Publication date: 2008-05-14
Anticipated expiration: 2027-11-09
Also published as: CN101178977B

Abstract

The invention relates to a capacitor comprising an upper cover (3), a metal bottom nail (4), an aluminum strip (5), a paper core (6), a metal shell (7) and a pair of capacitor terminals, wherein, the capacitor terminals consist of a first metal guide pillar in contact with the metal bottom nail (4) and a plastic shell (11) fixed on the first metal guide pillar (14); a cavity (112) is arranged inside the plastic shell (11) and above the first metal guide pillar (14); a stud (13) is positioned on the side of the plastic shell (11); one end of the stud (13) can clamp a second metal guide pillar which extends to a mother board inside the cavity. The invention has the advantages of decreasing the difficulty in the mother board processing, increasing the parasitic capacity, reducing the parasitic inductance value, improving the mechanical strength of the mother board and providing a better performance by adopting the laminated mother board designed with the capacitor having the terminal compared with the traditional structure.

Description

Capacitor

Technical field

The present invention relates to a kind of capacitor, relate in particular to the terminal structure of this capacitor.

Background technology

Because the stray inductance amount is little and have certain parasitic capacitance, stack bus bar more and more is applied to various fields.The parasitic capacitance of stack bus bar and stray inductance amount are relevant with the overlapping area and the phase mutual edge distance of stack bus bar, and overlapping area is big more, distance is more little, and parasitic capacitance is big more, inductance value is more little, and performance is also just good more.

By Fig. 1, Fig. 2 as seen: it is by upper conductor plate 8, insulating barrier 9, and lower conductor plate 10 and capacitance group are formed, and wherein electric capacity is string and series-parallel connection mode.Conventional bolt type terminal capacitance must be screwed into bolt with being connected between fixed conductor and the guide pillar, so must perforate on insulating barrier 9 and upper conductor plate 8 by top.The voltage of the bolt 1 that is connected with capacitor terminal 2 equates with capacitor terminal 2 voltages, with upper conductor plate 8 voltage difference is arranged, and exist creepage relation by insulating barrier 9 between the two, for guaranteeing the insulation distance between upper conductor plate 8 and the bolt 1, the size in hole will increase with the increase of voltage difference on the upper conductor plate 8, and its size will consequently have a strong impact on properties of product very greatly under the very high situation of voltage.Among the figure: loam cake 3, metal bottom nail 4, aluminum strip 5, refill 6, metal shell 7.

Such structure makes when stack bus bar and capacitor array are used in combination, because conventional bolt type terminal capacitance must be screwed into bolt from terminal upper portion, and bolt has certain thickness and links to each other with electrode, the top busbar must excise a part, as consider creepage distance, the part of excision increases with voltage difference; When voltage difference is big, to such an extent as to the very performances that badly influence stack bus bar of the part of excision more.

Summary of the invention

The technical issues that need to address of the present invention have provided a kind of capacitor, are intended to solve the above problems.

In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:

The present invention includes: loam cake, metal bottom nail, aluminum strip, refill, metal shell; Also comprise a pair of capacitor terminal; Described capacitor terminal comprises: follow closely the contacted first metal guide pillar, a plastic casing of fixing the first metal guide pillar with metal bottom for one, in plastic casing, the first metal guide pillar above leave cavity; At double-screw bolt of the other arrangement of plastic casing side; One end of described double-screw bolt can be clamped the second metal guide pillar on the motherboard that stretches in the cavity.

Compared with prior art, the invention has the beneficial effects as follows: using has the designed stack bus bar of electric capacity of this kind terminal to compare with traditional structure, has reduced the busbar difficulty of processing, improved parasitic capacitance, reduced the stray inductance amount, improved the busbar mechanical strength, better performance is provided.

Description of drawings

Fig. 1 is the stack bus bar capacitor array that adopts the screw bolt-type terminal capacitance to form;

Fig. 2 is a screw bolt-type terminal capacitance structure chart;

Fig. 3 is a structural representation of the present invention;

Fig. 4 is an explosive view of the present invention;

Fig. 5 shows is the state diagram of retaining mechanism of the present invention when unclamping;

The state diagram that Fig. 6 shows when being retaining mechanism locking of the present invention;

Fig. 7 shows is to use the structure of being made of a bottom busbar of stack bus bar capacitor array terminal capacitance of the present invention;

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

By Fig. 3, Fig. 4 as seen: the present invention includes: loam cake 3, metal bottom nail 4, aluminum strip 5, refill 6, metal shell 7; Also comprise a pair of capacitor terminal; Described capacitor terminal comprises: follow closely the 4 contacted first metal guide pillars 14, a plastic casing 11 of fixing the first metal guide pillar 14 with metal bottom for one, in plastic casing 11, the first metal guide pillar 14 above leave cavity 112; At double-screw bolt 13 of the other arrangement of plastic casing 11 sides; One end of described double-screw bolt 13 can be clamped the second metal guide pillar (not shown) on the motherboard that stretches in the cavity 112;

The last transverse plane of described guide pillar 14 has a rectangular metal catch 142, and the cylinder center of circle is partial in its position; Guide pillar 14 near on annular groove 140 and breach 141 are arranged near the transverse plane; Be enclosed within rectangular metal catch 142 outsides with a ferrule 12,142 liang of side-to-side anastomosis of its both sides and catch, in addition certain distance is left at two sides and catch 142 fronts and the back side, and at itself and catch 142 machining screw through hole on the wall that simultaneously contacts of the center of circle dorsad; With plastic casing 11 with guide pillar 14 tops and ferrule 12 covers and be fixed by annular groove on the guide pillar 14 140 and breach 141; Plastic casing 11 tops cavity 112 is arranged and lead to ferrule 12 and metal catch 142 between the space; There are guide hole 111 and bayonet lock 110 in the position that plastic casing 11 is corresponding with ferrule 12 upper screwed holes; Double-screw bolt 13 passes guide hole 111 and cooperates with screwed hole in the ferrule 12, and is fixed in enclosure by the bayonet lock on the plastic casing 11 110; The bottom of guide pillar 14 is fixed in aluminum strip 5 and metal bottom nail 4 on the guide pillar 14 by crimping.

Metal bottom nail and aluminum strip are fixed by the bottom of crimping and metal guide pillar among the present invention.Annular groove on the metal guide pillar and breach have played the effect of fixed plastics shell.The rectangular metal catch cooperates the effect that clamps external conductor (the second metal guide pillar) of playing with ferrule and bolt.Guide hole on the plastic casing is used for the location and the installation of bolt, and bayonet lock plays set bolt and prevents the effect that it comes off.Plastic casing inside has cavity structure, and holding metal catch and ferrule, its upper wall has through hole penetrating external conductor, lower wall have with the metal guide pillar on annular groove and the breach yoke configurations of coincideing.

As seen from Figure 5: when turning double-screw bolt 13, because it is fixing by guide hole on the plastic casing 11 111 and bayonet lock 110, so ferrule 12 will be moved along the axial direction of double-screw bolt 13, when itself and metal catch 142 be the retaining mechanism releasing orientation towards the center of circle one side distance when maximum, can put into or shift out external conductor.

As seen from Figure 6: is locking state by turning double-screw bolt 13 when making simultaneously coincideing towards the center of circle of ferrule 12 and metal catch 142, can external conductor is fixing in guide pillar 14.

As seen from Figure 7: it is riveted on the second metal guide pillar 150 on the copper coin 15, and another side is processed smooth.

Claims

1. a capacitor comprises: loam cake (3), metal bottom nail (4), aluminum strip (5), refill (6), metal shell (7); Also comprise a pair of capacitor terminal; It is characterized in that: described capacitor terminal comprises: one with metal bottom nail (4) contacted first metal guide pillar (14), a plastic casing (11) of fixing the first metal guide pillar (14), in plastic casing (11), the top of the first metal guide pillar (14) leaves cavity (112); At the other double-screw bolt (13) of settling of plastic casing (11) side; One end of described double-screw bolt (13) can be clamped the second metal guide pillar on the motherboard that stretches in the cavity (112).

2. capacitor according to claim 1 is characterized in that: the last transverse plane of described guide pillar (14) has a rectangular metal catch (142), and the cylinder center of circle is partial in its position; Near near the last transverse plane annular groove (140) and breach (141) are arranged at guide pillar (14); Be enclosed within rectangular metal catch (142) outside with a ferrule (12), its both sides and catch (142) two side-to-side anastomosis, in addition certain distance is left at two sides and catch (142) front and the back side, and at itself and catch (142) machining screw through hole on the wall that simultaneously contacts of the center of circle dorsad; With plastic casing (11) with guide pillar (14) top and ferrule (12) covers and be fixed by annular groove (140) on the guide pillar (14) and breach (141); Plastic casing (11) top cavity (112) is arranged and lead to ferrule (12) and metal catch (142) between the space; There are guide hole (111) and bayonet lock (110) in the position that plastic casing (11) is corresponding with ferrule (12) upper screwed hole; Double-screw bolt (13) passes guide hole (111) and cooperates with screwed hole in the ferrule (12), and is fixed in enclosure by the bayonet lock (110) on the plastic casing (11); The bottom of guide pillar (14) is fixed in aluminum strip (5) and metal bottom nail (4) on the guide pillar (14) by crimping.